The purpose of the study is to see if new methods can be used to determine why Multidrug Therapy (MDT), used to cure leprosy patients effectively for twenty years, is not as effective against Leprosy in the Philippines. Researchers do not know how people get infected with leprosy or what causes the disease to relapse after cure with adequate MDT. Blood, skin scrapings, nasal swabs and biopsies, will be collected from leprosy patients to perform tests related to the detection of the disease and the germ. The tests will be used to find out if the bacteria in the body are related to the bacteria found in other patients or contacts. This will help the researchers to know where these bacteria come from, and to see how they spread. Other tests will be performed to see if the bacteria can be killed by two common medicines given to leprosy patients. Study participants will include individuals age 18 and older presenting to Leonard Wood Memorial for the diagnosis and/or relapse of leprosy.